Lipitor, also known as atorvastatin, is a medication used to lower cholesterol levels in the blood. According to the sources provided, there are no specific vitamins to avoid when taking Lipitor. However, it is recommended to avoid grapefruit and grapefruit juice as they can increase the risk of side effects from the medication [2]. Additionally, some supplements, such as red yeast rice, may contain compounds that can interact with statins, including Lipitor, and increase the risk of side effects [3]. It is important to speak with a healthcare provider before taking any new supplements or medications while on Lipitor to ensure there are no potential interactions or negative effects [2][3].

Sources:
[2] https://www.singlecare.com/blog/atorvastatin-interactions/
[3] https://www.consumerlab.com/answers/which-drugs-should-be-avoided-when-taking-statins/statin-supplement-interactions/